XSelectionRequestEvent - SelectionRequest event structure
The structure for SelectionRequest events contains:
typedef struct {
int type; SelectionRequest
unsigned long serial; # of last request processed by server
Bool send_event; true if this came from a SendEvent request
Display *display; Display the event was read from
Window owner;
Window requestor;
Atom selection;
Atom target;
Atom property;
Time time;
} XSelectionRequestEvent;